<template>
	<view>
    <!-- 使用自定义搜索组件 -->
    <my-search @myClick="gotoSearch"></my-search>
    <!-- 滚动内容区域 -->
	<view class="scroll-view-container">
	  <!-- 左侧滚动试图区域 -->
    <scroll-view class="left-scroll-view" scroll-y :style="{height:wh+'px'}">
      <block v-for="(item,i) in cateList" :key="i">
        <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view> 
      </block>
    </scroll-view>
    <!-- 右侧滚动视图区域 -->
    <scroll-view class="right-scroll-view" scroll-y :style="{height:wh+'px'}" :scroll-top="scrollTop">
      <!-- 二级分类的标题 -->
      <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
        <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
        <!-- 三级分类的列表数据 -->
        <view class="cate-lv3-list">
          <view class="cate-lv3-list-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotGoodsList(item3)">
            <!-- 图片 -->
            <image :src="item3.cat_icon" mode="widthFix"></image>
            <!-- 文本 -->
            <text>{{item3.cat_name}}</text>
            
          </view>
        </view>
      </view>
    </scroll-view>
	</view>	
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh:0,
        // 分类列表的数据
        cateList:[],
        // 被激活项
        active:0,
        // 二级分类列表
        cateLevel2:[],
        // 滚动条的位置
        scrollTop:0,
			};
		},
    onLoad(){
     const sysInfo= uni.getSystemInfoSync()
     this.wh=sysInfo.windowHeight-50
     this.getCateList()
	},
  methods:{
    async getCateList(){
      const {data:res}=await uni.$http.get('/api/public/v1/categories')
      if(res.meta.status!==200) return uni.$showMsg()
      this.cateList=res.message
      this.cateLevel2=res.message[0].children
    },
    activeChanged(i){
      this.active=i
      this.cateLevel2=this.cateList[i].children
      this.scrollTop=this.scrollTop===0?1:0
    },
    // 点击三级分类跳转到商品列表
    gotGoodsList(item3){
 // 跳转到非tabbar分包
      uni.navigateTo({
        url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
      })
    },
 // 搜索
 gotoSearch(){
   uni.navigateTo({
     url:'/subpkg/search/search'
   })
 }
  },
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  }
  .left-scroll-view{
    width: 120px; 
  }
  .left-scroll-view-item{
    background-color: #f7f7f7;
    line-height: 60px;
    font-size: 12px;
    text-align: center;
    
    &.active{
      background-color: #fff;
      position: relative;
      
      &:before{
        content:'';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    text-align: center;
    font-weight: bold;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    }
    .cate-lv3-list-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
</style>
